<!DOCTYPE html>
<html>
  <head>
    <style>
      .ball {
        position: fixed;

        width: 10px;
        height: 10px;
        border-radius: 100%;
        background-color: red;
      }
    </style>
  </head>
  <body>
    <script src="./index.js"></script>
  </body>
</html>
